CANNON FALLS, Minn. – About 80 searchers combed woods near Cannon Falls and also the Cannon River itself for a man who went missing out walking his dog. Christopher Dobson, age 60, routinely took his dog on a wooded trail toward the Cannon River. The dog returned alone at a neighbor’s house.This was about 8 p.m. Tracks were found from Dobson’s home in the 300 block of Larkspur Lane.and also on the ice along the river’s edge. Police Chief Jeffrey McCormick asked people in the neighborhood to check sheds and low-light areas in case Dobson had fallen in the river and struggled to find the nearest shelter and warmth.